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Hallasan

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Hallasan Weather, Climate and Best Time to Visit

Data source:Meteostat
Update date:2025-09

Hallasan year round climate

  • Spring (March–May): Average 51–64°F, mild climate with abundant rainfall, suitable for hiking and trekking. Common activities: flower viewing, hiking, trekking. Recommended clothing: light jacket, long-sleeved clothing, comfortable hiking shoes.
  • Summer (June–August): Average 72–83°F, hot and humid, with more rainfall, especially frequent in June and July. Common activities: short stays at summer resorts, enjoying mountain views. Recommended clothing: breathable and sweat-wicking clothing, light rain gear.
  • Autumn (September–November): Average 66–77°F, comfortable and pleasant climate, September has the most rainfall, but overall rainfall decreases. Common activities: hiking, trekking, viewing maple leaves (depending on actual conditions). Recommended clothing: light jacket or long-sleeved clothing.
  • Winter (December–February): Average 43–46°F, cold and dry, with possible snowfall. Common activities: enjoying winter mountain scenery (pay attention to safety). Recommended clothing: warm clothing, thick jacket, waterproof and windproof jacket, warm hat, gloves, and scarf.

Hallasan climatological average

Annual average temperature: approx. 62.6°F / Annual rainfall: approx. 1705 mm / Summer humidity: 70%–80% / Rainiest month: September

Hallasan monthly average temperature and precipitation

Month
Air temperature (°F)
Precipitation (mm)
January
43.9°F
99
February
45.1°F
97.5
March
51.4°F
114.9
April
58.8°F
121.6
May
64.6°F
148.8
June
72.5°F
215.7
July
81.7°F
207.3
August
83.3°F
109.5
September
77.5°F
225.8
October
66.6°F
87.8
November
57.9°F
201.5
December
46.8°F
76

Hallasan weather for the next seven days

7/5
Sunday
Light rain shower
74.1°F/72°F
7/6
Monday
Sunny
77.6°F/72.7°F
7/7
Tuesday
Mist
79.2°F/73.3°F
7/8
Wednesday
Mist
79°F/73.2°F
7/9
Thursday
Mist
79.6°F/72.9°F
7/10
Friday
Partly Cloudy
80.1°F/74.8°F
7/11
Saturday
Patchy rain nearby
81°F/76.3°F